CN102575793A

CN102575793A - Flow rate control valve

Info

Publication number: CN102575793A
Application number: CN200980161137.2A
Authority: CN
Inventors: 山田博介; 中村早苗; 栗林昭
Original assignee: SMC Corp
Current assignee: SMC Corp
Priority date: 2009-08-27
Filing date: 2009-08-27
Publication date: 2012-07-11
Anticipated expiration: 2029-08-27
Also published as: WO2011024275A1; EP2472154A4; KR101324957B1; EP2472154A1; JP5467470B2; KR20120041771A; EP2472154B1; RU2012111193A; RU2560661C2; US20120174997A1; US8573251B2; CN102575793B; JPWO2011024275A1

Abstract

A flow rate control valve, wherein the flow rate control valve (10) is provided with a first circular tube section (22) having first and second ports (12, 14) formed on a body (16) forming the flow rate control valve (10), and also with a plate section (28) mounted to the upper part of the first circular tube section (22) through a mounting section (26a). The plate section (28) is provided to only one end side of the first circular tube section (22), is supported on the mounting section (26a) in a cantilever manner, and is formed flat.

Description

Flow control valve

Technical field

The present invention relates to a kind of flow control valve, can come control flows to cross the flow of the fluid between a pair of import and export through moving bar vertically with valve member.

Background technique

So far, for example, through pipeline be connected to fluid pressure device such as cylinder, to control the flow control valve of operation of fluid pressure device through the flow velocity of control fluid turnover fluid pressure device more known.

For the flow control valve of this type, it is disclosed the sort of to open the 2001-141090 communique like the spy, and the main valve body of cast is installed in the middle part of the Cylindrical object of rectilinear form, and said main valve body cardinal principle is perpendicular to the length direction of said Cylindrical object.

The throttle valve that is used for regulating the flow (speed) of Cylindrical object internal flow fluid is threaded into the through hole of main valve body, and throttle valve can move forward and backward by this way.The flow of fluid (speed) is adjusted through moving forward and backward of throttle valve.

Above-mentioned flow control valve generally is in the position that the fluid pressure device with cylinder and so on separates, and generally passes through telecontrol.Moreover, manifold (manifold) often is used, and multiple arrangement is set to be communicated with it.In this case, be difficult to confirm the runnability of whole control valves in a plurality of flow control valves.In addition, this flow control valve often form both sides (about) symmetry, thereby be difficult to confirm direction of flow from the outside of flow control valve.

Summary of the invention

Overall purpose of the present invention is to provide a kind of flow control valve, can the convenient flow direction of confirming fluid far and away.

The invention is characterized in provides a kind of flow control valve; Said flow control valve can be through moving the flow that the shaft with valve member is controlled flowing fluid between a pair of import and export vertically; Said flow control valve comprises: import and export, said import and export are separately positioned on an end and another place, end; And valve body, said valve inner has flow channel, and the said fluid that import and export from said import and export provide flows through said flow channel; Wherein on said valve body, direction indicating device only is arranged near the import and export in the said import and export, and faces outside the said valve body.

Above-mentioned and other purposes, characteristic and advantage of the present invention, will from below in conjunction with accompanying drawing, with the signal the mode description of preferred embodiments more obvious.

Description of drawings

Fig. 1 is the outer side perspective view of flow control valve according to an embodiment of the invention;

Fig. 2 is a flow control valve external side view shown in Figure 1;

Fig. 3 is the outside plan view of flow control valve shown in Figure 1;

Fig. 4 is the whole longitudinal sectional view of flow control valve shown in Figure 1;

Fig. 5 is the amplification sectional view of needle valve, valve seat and the seat ring near zone of formation flow control valve shown in Figure 1; And

Fig. 6 is the board member of the flow control valve shown in Figure 2 external side view under the state when notch upwards bends.

Embodiment

Shown in Fig. 1-5, flow control valve 10 comprises valve body 16, valve system 18 and handle 20.Valve body 16 has first and imports and exports 12 and second import and export 14, and fluid is infeeded and discharges from these two import and export.Valve system 18 is positioned at the middle part of valve body 16, is used to control the flowing state that flows to the pressure fluid (such as pressurized air) of second import and export 14 from first import and export 12.Handle 20 is through the flow of valve system 18 manual pilot pressure fluids.Fig. 4 shows being communicated with by the complete closed state of needle valve (bar) 54 (the back literary composition is described) when blocking, the part of needle valve 54 formation valve systems 18 between first import and export 12 and second import and export 14.

Valve body 16 comprises first columnar part 22 and second columnar part 24.First columnar part 22 is along straight-line extension, second columnar part 24 be connected to first columnar part 22 first columnar part 22 axially on approximate mid-section.Second

columnar part

24 and 22 vertical connections of first columnar part, and extend upward predetermined height from first columnar part 22.Two

annex

26a and 26b be respectively formed at first columnar part 22 and second columnar part, 24 intersectional regions near, and be approximately perpendicular to the axis of first columnar part 22, not shown bolt passes wherein.In addition, flow control valve 10 can be through being bolted on another unshowned device, and bolt passes the through hole 27 of

annex

26a and 26b.

Board member 28 is arranged on one of them annex 26a, and extends to one distolateral (direction shown in the arrow A) of first columnar part 22 from the top of annex 26a.Board member 28 for example, is formed by resin material, and rectangular substantially, shaped flat has constant thickness, and towards downward-sloping gradually away from the direction (direction shown in the arrow A) of annex 26a.More particularly, board member 28 links to each other with the top of annex 26a, thereby has identical height with the top of annex 26a; Its other end is positioned at the top of first columnar part 22, inclines to first columnar part, 22 directions simultaneously and leans on (seeing Fig. 2 and 4).In other words, board member 28 forms cantilever (cantilever) shape, and only an end obtains to support on annex 26a.

In addition, board member 28 is formed with notch 29 on the one of which end.This notch 29 is positioned at board member 28 on the lower surface of first columnar part 22, and its cut-out section is triangular in shape.Notch 29 is set at the position near annex 26a.In addition, can post at the upper surface of board member 28, for example, the identification label (not shown) that can observe from the top.In addition, numeral, character or other signs that needn't label and just can reach the identification purpose also can directly be write on board member 28.

Be used to introduce first of pressure fluid import and export 12 be opened on first columnar part 22 an end, be used for second of head pressure fluid import and export 14 be opened on first columnar part 22 the other end.In addition, pipe 31a and 31b are connected in first import and export, 12 and second import and export 14 through linkage unit 30a and 30b.Linkage

unit

30a and 30b are installed in the opening of first, second import and export 12 and 14.

Particularly, for example, through the pressure fluid that pipe 31a is infeeded, be introduced in first and import and export 12 from a not shown pressure fluid supply source; Meanwhile, flow through valve body 16 pressure inside fluids through importing and exporting the 14 pipe 31b that link to each other and be fed in the another one pressure fluid device (such as cylinder) with second.

In addition, the side of first columnar part 22 is formed with the depression 32 of shape general flat, and this depression 32 caves inward from the outer surface with first columnar part 22 of circular section.32 positions of caving in are in the below of second columnar part 24 and annex 26a, form the axis that is roughly parallel to first columnar part 22, and are roughly rectangular, and have fixing area.Moreover, on depression 32,, can discern the wherein flow direction of fluid from the outside of flow control valve 10 through vision through writing JIS (JIS) symbol or similar mark.

Particularly, when observing from the top of valve body 16, depression 32 only is positioned at a side surface of first columnar part 22, and be positioned at second columnar part 24 the center around.32 be not arranged on the other side of first columnar part 22 because of caving in, thus the installation direction of flow control valve 10 and wherein the flow direction of fluid all can easily confirm from 32 the present position of caving in.

On the other hand; (direction shown in arrow A and the B) imported and exported 12 and second from first and imported and exported the first passage 33 of 14 extensions and second channel 34 is formed on first columnar part 22 in the lump with communication chamber 36 inside vertically, and communication chamber 36 is formed between first passage 33 and the second channel 34.O-ring seal 38 is installed in respectively in first and

second passages

33 and 34, near linkage unit 30a and 30b.In addition, ring liner 40 is installed in the position of seal ring 38 respectively.

Liner 40 is suitable with the step that is formed in first passage 33 and the second channel 34, thereby restriction liner 40 moves to the middle part of first columnar part 22, and liner 40 is secured in place in this way.The moving of seal ring 38 of pressing close to liner 40 also is restricted, and makes the position of seal ring 38 fixing by liner 40.In addition, be resisted against on the seal ring 38, thereby prevent that pressure fluid from leaking from the periphery survey of pipe 31a and 31b from the pipe 31a of first, second import and export 12 and 14 insertions and the outer surface of 31b.

In addition, an end place of first passage 33 is provided with the first wall 42 towards communication chamber 36, and first wall 42 is perpendicular to the bearing of trend (direction shown in arrow A and the B) of first passage 33.First passage 33 is communicated with communication chamber 36 through the communication passage 44a that is opened between first wall 42 and first passage 33 inner wall surface.Similarly; Be arranged on an end of second channel 34 towards second wall 46 of communication chamber 36; Perpendicular to the bearing of trend of first passage 34, and second channel 34 is communicated with communication chamber 36 through the communication passage 44b that is opened between second wall 46 and second channel 36 inner wall surface.

In first passage 33, first wall 42 extends upward, and, thereby makes communication passage 44a be formed on the place, top position in the first passage 33 promptly from bottom to top.In second channel 34, second wall 46, thereby makes communication passage 44b be formed on the lower position in the second channel 34 promptly from top to bottom to extending below.

In other words, communication passage 44a in the first passage 33 and the communication passage 44b in the second channel 34 are on the reciprocal position on the direction perpendicular to first columnar part, 22 axis.

The communication chamber 36 and second columnar part 24 are formed on the same axis.The part of valve system 18 is inserted into the inside of communication chamber 36.

Second columnar part, 24 openings make progress, and its inside is formed with the vertically mounting hole 48 of (vertical direction) extension, and mounting hole 48 is used for valve system 18 is laid wherein.Mounting hole 48 is communicated with the communication chamber 36 of first columnar part 22.Particularly, the communication chamber 36 of the mounting hole 48 and first columnar part 22 is formed on the same axis.

Valve system 18 includes the seat ring 52 and the needle valve 54 of valve seat 50, tubulose.Valve seat 50 is pressed and inserts in the mounting hole 48 of second columnar part 24; Seat ring 52 is installed in the bottom of valve seat 50; Needle valve 54 inserts the inside of valve seat 50 and seat ring 52, can be along axial (direction shown in arrow C and the D) displacement of second columnar part 24.

Valve seat 50 forms column, and its outer surface is formed with isolated a pair of teat 56a of intended distance and 56b.One of them teat 56a for example, is made up of knob (knurls), through with mounting hole 48 in a groove fit prevent that valve seat 50 from rotating with respect to second columnar part 24.In addition, another one teat 56b through another engage grooves of itself and mounting hole 48, is used to prevent that pressure fluid is from leaking between mounting hole 48 and the valve seat 50.At this moment, the upper end of valve seat 50 is installed into the upper end that is slightly higher than second columnar part 24.

The lower end of valve seat 50 is formed with holder 58.This holder 58 radially inwardly has the diameter that dwindles slightly, is formed with the circular groove 60 that radially caves inward in the top.In addition, seat ring 52 is installed on the holder 58, thereby covers the outer surface of holder 58.The curved part 66 (the back literary composition is described) that is formed on seat ring 52 upper ends inserts and is bonded in the circular groove 60.Therefore, seat ring 52 one are connected to the lower end of valve seat 50.

In addition, the lower end surface 58a shape of holder 58 is smooth, perpendicular to the axis of valve seat 50.

On the other hand, the inside of valve seat 50 is formed with the valve opening 62 of fixed diameter, and needle valve 54 (direction shown in arrow C and the D) vertically inserts wherein.First screw section 42 of attacking female thread is arranged on the upper end of valve opening 62.First screw section 64 radially inwardly has the diameter that the internal surface than valve opening 62 dwindles slightly.

Seat ring 52 for example, adopts the metallic sheet stock die forming, and is arranged in the communication chamber 36.Seat ring 52 by formed thereon the large-diameter portion 68 that links to each other with valve seat 50, be formed at its underpart be used to hold receive needle valve 54 minor diameter 70 and be formed on large-diameter portion 68 and minor diameter 70 between intermediate portion 72 constitute.Large-diameter portion 68 is formed with maximum diameter; Intermediate portion 72 is formed with less diameter, and its diameter is littler than the diameter of large-diameter portion 68; Minor diameter 70 forms has littler diameter, and its diameter is also littler than the diameter of intermediate portion 72.

More particularly, seat ring 52 forms to its lower end from the upper end and has the stepped diameter that reduces.And above-mentioned large-diameter portion 68, intermediate portion 72 and minor diameter 70 are common to be formed along same axis.

Curved part 66 is formed on the upper end of large-diameter portion 68, radially slopes inwardly with predetermined angle.When thereby large-diameter portion 68 is pressed when insert covering the holder 58 of valve seat 50, curved part 66 joins in the circular groove 60.Meanwhile, the lower end abutment of holder 58 is on the end difference (supporter) 74 at border region place between large-diameter portion 68 and the intermediate portion 72.This end difference 74 is connected with the upper end of intermediate portion 72 from the radially inwardly vertical bending of lower end edge of large-diameter portion 68.

Therefore, when seat ring 52 is installed in 58 last times of holder of valve seat 50, the end difference 74 of seat ring 52 with against mode latch in the end of holder 58, thereby be positioned along axial (direction shown in arrow C and the D) of valve seat 50.

Intermediate portion 72 is along being formed with a plurality of (such as 4) UNICOM's mouth 76 on its surface perpendicular to seat ring 52 axis, thereby the inside and outside maintenance of intermediate portion 72 is communicated with.Connecting port 76 is along the outer surface equi-spaced apart of intermediate portion 72.UNICOM's mouth 76 together forms with the mode and the seat ring 52 of mold pressing.In other words, the formation of UNICOM's mouth 76 need not other process step.

Radially inwardly charge near minor diameter 70 and the zone that intermediate portion 72 is connected, thereby form seat part 78, needle valve 54 can be supported on this seat part 78.Meanwhile, the lower end of minor diameter 70 is formed with the flange 80 that diameter radially expands outwardly.In addition, the tubular seal of being processed by the elastic material of rubber and so on 82 is installed in the outer circumferential side of minor diameter 70.In addition, being formed on Sealing 82 outer surfaces is resisted against respectively on the first wall 42 and second wall 46 in the communication chamber 36 with the predetermined radially acclivitous rib 84 of angle.

As a result, in communication chamber 36, blocked by Sealing 82 by way of the outer circumferential side and the flowing of the pressure fluid between the first and

second wall portions

42 and 46 of seat ring 52.Moreover, because of Sealing 82 be maintained at flange 80 and be formed on intermediate portion 72 and the end difference at minor diameter 70 juncture area places between, so Sealing 82 is positioned, being difficult for vertically, (direction shown in arrow C and the D) is shifted.

Needle valve 54 forms from shaft, and (direction shown in arrow C and the D) has predetermined length vertically.The upper end of needle valve 54 projects upwards with respect to the upper end of the valve seat 50 and second columnar part 24, and links to each other with handle 20.Moreover, attack the outer circumferential side that threaded second screw section 86 is formed on needle valve 54 near the upper end, and adaptive with first screw section, 64 spirals of valve seat 50.Particularly, rotate needle valve 54 by handle 20, through adaptive with the screw thread of valve seat 50, needle valve 54 (direction shown in arrow C and the D) vertically moves with the mode of advancing and retreat.

On the other hand, the lower end of needle valve 54 is formed with control piece 88, and this control piece 88 diameter when leveling off to its end reduces gradually, can insert in the minor diameter 70 of seat ring 52.Control piece 88 comprises first control surface 90 and second control surface 92 that is formed on first chain of command, 90 tops that is arranged on its distal-most end.The axis that first control surface 90 is set to respect to needle valve 54 has certain angle of inclination, and this angle of inclination is greater than the angle of inclination of second control surface 92.

In addition; Through with 54 upward displacements of the needle valve under the state shown in Figure 1; Be separated by the seat part 78 of second control surface 92 with seat ring 52, pressure fluid passes between the seat part 78 and second control surface 92, in seat ring 52, flows to minor diameter 70 1 sides from intermediate portion 72.

In addition, the top of control piece 88 is formed with stopper 94, and the diameter of this stopper 94 expands outwardly with respect to control piece 88.O type ring 96 is installed on the outer surface of stopper 94, and the interior perimeter surface with valve opening 62 in valve seat 52 keeps continuous sliding contact.As a result, O type ring 96 blocked the pressure fluids that are introduced in the seat ring 52 through valve opening 62 to external leakage.

In addition, when needle valve 54 was shifted vertically, the valve opening 62 of the upper end edge valve seat 50 of stopper 94 moved.Through the stopper 94 inwardly lower end of the first outstanding screw section 64 of conflicting radially, the displacement that needle valve 54 makes progress (along direction shown in the arrow D) is restricted.Meanwhile, through the watershed area of lower end abutment seat ring 52 between minor diameter 70 and intermediate portion 72 of stopper 94, needle valve 54 downward displacements (along direction shown in the arrow C) are restricted.

In addition, (part) top of constituting second cylindrical component 24 of valve body 16 is provided with the locking nut 98 coaxial with second cylindrical component 24.Second screw section 86 of needle valve 54 is adaptive with the central spiral of locking nut 98.In addition; Needle valve 54 be rotated be displaced to a certain position results in pressure fluid and flow through the inside of valve body 16 with predetermined flow (speed) after; Lock the upper end that the tight nut 98 of displacement makes its valve 50 through screwing; The flow control state just can be kept by needle valve 54, because the displacement that is further rotated of needle valve 54 is restricted.

Based on the structure of the flow control valve 10 of the specific embodiment of the invention basically as above.Next the operation and the effect of flow control valve 10 will be described.Original state as shown in Figure 1 will be described here.Under this original state, needle valve 54 nationalitys of formation valve system 18 are rotated to low level by the spinning movement of handle 20, are in by the complete closed state of needle valve 54 blocking-up being communicated with between 12 thereby first import and export 12 and second are imported and exported.

Under such original state, pressure fluid is supplied to first through pipe 31a and imports and exports 12, and further is supplied to communication chamber 36 through communication passage 44a.82 of the Sealings that the pressure fluid of injection communication chamber 36 is set at seat ring 52 outer circumferential sides stop, prevent that it from flowing through the outer circumferential side of seat ring 52, and flow to second import and export 14 downstream.In addition; Screwing locking nut 54 at operator's (not shown) moves up it; Thereby remove after the restrictive condition of needle valve 54 rotation displacements; Handle 20 is by grasping and rotation, and when needle valve 54 rotated with valve seat 50 threaded joint ground, needle valve 54 is upward displacement (along direction shown in the arrow D) thus.

As a result, the state from second control surface 92 of control piece 88 against seat part 78, needle valve 54 separates with seat part 78 gradually, and the gap between second control surface 92 and the seat part 78 increases gradually.In addition, the pressure fluid that injects communication chamber 36 flow into the inside of seat ring 52 from the connecting port 76 of seat ring 52, and flows to minor diameter 70 1 sides through (along direction shown in the arrow C) between the control piece 88 of seat part 78 and needle valve 54.At this moment, the flow of pressure fluid (speed) is according to the control that is in proportion in gap between the control piece 88 of seat part 78 and needle valve 54.After pressure fluid flowed to second channel 34 through communication passage 44b from the inside of communication chamber 36, pressure fluid flowed to predetermined flow (speed) through pipe 31b and second imports and exports 14 another fluid pressure devices of linking to each other.

More particularly, needle valve 54 vertically (direction shown in arrow C and the D) displacement amount with flow to through communication chamber 36 second import and export the pressure fluid of 14 place sides flow (speed) be ratio.In other words, through the displacement amount of control needle valve 54, the flow of pressure fluid (speed) is controlled.

In addition; Through rotatable handle 20; Make second control surface 90 of needle valve 54 move to the position of faces seat portion 78; Can further increase the flow (speed) of the pressure fluid between the seat part 78 and first control surface 90 of flowing through, because the inclination angle of first control surface 90 is greater than the tilt angle of second control surface 92.

On the other hand, under the situation that reduces pressure fluid flow (speed), handle 20 is by according to rotating with above description opposite direction, thereby makes needle valve 54 move down (along direction shown in the arrow C) along valve seat 50.As a result, control piece 88 convergence seat part 78, because of the gap between control piece 88 and the seat part 78 diminishes gradually, the flow (speed) that flows to the pressure fluid in downstream side through the gap is able to be reduced.In addition, through being further rotated handle 20, make stopper 94 in the needle valve 54 against seat part 78, moving down of needle valve 54 is controlled, produces the complete closed state of second control surface 92 of control piece 88 against seat part 78.

In this manner, import and export 14 through pipe 31b from second with the predetermined controlled fluid of flow (speed) in the flow control valve 10 and be fed into another fluid pressure device, thereby make the operation of fluid pressure device controlled.

According to aforementioned manner, in the present embodiment, flat board member 28 is arranged on the top position place of valve body 16, and only is positioned at the distolateral of valve body 16.As a result, because the existence of board member 28, one of flow control valve 10 distolaterally distolaterally can be confirmed by convenient with another far and away.Meanwhile, the flow direction that flows through the inner fluid of flow control valve 10 also can be determined.

In addition, because of the flow direction of fluid in the flow control valve 10 can be confirmed by board member 28, so when flow control valve 10 was mounted, situation about being mounted with the direction of mistake was able to be prevented from.More particularly, board member 28 is to play a role as indicative device (device of direction indication).Through board member 28, the installation direction of control valve for fluids 10 and the flow direction of fluid can both be confirmed.

Moreover; For example; Through paste identification label or similar marker at the upper surface of board member 28, even when flow control valve 10 is used with other flow control valves as the part of manifold, desirable flow control valve 10 also can be confirmed easily and reliably.

In addition, because of the upper surface of board member 28 is smooth, when identification label was attached to the upper surface of board member 28, identification label can suit to keep the attaching state.In other words, the surface of board member 28 is not made into curved shape, but processes even shape, and this makes and attach identification label or similar marker difficult drop-off on it, and keeps suitable attaching state.

In addition, because of the flat recess 32 from outer surface depression only is arranged on a side of first columnar part 22, through confirming the position of depression 32, the flow direction of the fluid of the flow control valve 10 and the flow control valve 10 of flowing through both can conveniently be confirmed from the outside reliably.

In addition, be installed at flow control valve 10 under the situation of small space, such as in supporter or wall part, the board member 28 that is positioned at first columnar part, 22 tops is touched with the space is peripheral, thereby makes the installation in position of flow control valve 10 be tending towards difficulty.Even in this case, as shown in Figure 6, the other end through catching board member 28 also imposes power upwards, and this other end is upwards rotated around notch 29, and board member 28 ruptures from notch 29, thereby is bent upwards or fractures.Therefore, board member 28 is can be easily separated from the valve body 16, can be installed to desirable position thereby make board member 28 be removed later flow control valve 10.

Flow control valve of the present invention is not limited to the foregoing description, and only otherwise deviate from essence of the present invention, various other structures can certainly be adopted.

Claims (according to the modification of the 19th of treaty)

1. flow control valve, said flow control valve can is characterized in that said flow control valve comprises through moving the flow that the shaft (54) with valve member is controlled streaming flow between a pair of import and export (12,14) vertically:

Import and export (12,14), said import and export (12,14) are separately positioned on an end and another place, end; With

Valve body (16), said valve body (16) inside has flow channel (33,34), and the said fluid that the import and export (12) from said import and export provide flows through said flow channel (33,34);

Wherein, on said valve body (16), direction indicating device only is arranged near the import and export in the said import and export (12,14), and faces outside the said valve body (16); And

Said direction indicating device is provided with recognition device, and said recognition device makes said flow control valve to be identified.

2. flow control valve as claimed in claim 1 is characterized in that, said direction indicating device comprises flat board member (28).

3. flow control valve as claimed in claim 2 is characterized in that said direction indicating device is arranged on the top of said valve body (16).

4. flow control valve as claimed in claim 2 is characterized in that, said board member (28) one ends are connected to valve body (16) with the mode of cantilever.

5. flow control valve as claimed in claim 4 is characterized in that, said board member (28) further comprises notch (29), and said notch (29) is along the thickness direction otch of said board member (28), and wherein said notch (29) is arranged near the said end.

6. (increase) flow control valve as claimed in claim 2 newly, it is characterized in that, said recognition device comprises the label that is attached on the said board member (28).

7. (increase) flow control valve as claimed in claim 2 newly, it is characterized in that, said recognition device comprises the character of writing on said board member (28).

Claims

1. flow control valve, said flow control valve can is characterized in that said flow control valve comprises through moving the flow that the shaft (54) with valve member is controlled flowing fluid between a pair of import and export (12,14) vertically:

Valve body (16), said valve body (16) inside has flow channel (33,34), and the said fluid that the import and export (12) from said import and export provide flows through said flow channel (33,34); Wherein on said valve body (16), direction indicating device only is arranged near the import and export in the said import and export (12,14), and faces outside the said valve body (16).

4. flow control valve as claimed in claim 2 is characterized in that, an end of said board member (28) is connected to said valve body (16) with the mode of cantilever.